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resources:eval:ad9525-user-guide [14 Feb 2013 21:06] – [EVALUATION SOFTWARE COMPONENTS] Kyle Slightom | resources:eval:ad9525-user-guide [03 Jan 2021 22:11] (current) – fix links Robin Getz | ||
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====== AD9525 Evaluation Board User Guide ====== | ====== AD9525 Evaluation Board User Guide ====== | ||
- | ===== GENERAL DESCRIPTION ===== | ||
- | ---- | + | =====Features===== |
- | + | ||
- | The [[adi> | + | |
- | + | ||
- | <WRAP centeralign> | + | |
- | {{: | + | |
- | \\ | + | |
- | **Figure 1. AD9525/ | + | |
- | </ | + | |
- | + | ||
- | <WRAP column 48%> | + | |
- | <WRAP round box> | + | |
- | // | + | |
* Simple power connection using 6 V wall adapter and on board LDO voltage regulators | * Simple power connection using 6 V wall adapter and on board LDO voltage regulators | ||
* 6 ac-coupled differential LVPECL SMA connectors | * 6 ac-coupled differential LVPECL SMA connectors | ||
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* Easy access to digital I/O and diagnostic signals via I/O header | * Easy access to digital I/O and diagnostic signals via I/O header | ||
* Status LEDs for diagnostic signals | * Status LEDs for diagnostic signals | ||
- | </ | ||
- | <WRAP column 48%> | + | =====Equipment Needed===== |
- | <WRAP round box> | + | * Reference oscillator or signal generator |
- | // | + | * Other evaluation board to be clocked or test equipment |
- | * LTE and multicarrier GSM base stations | + | * Converters, DDS, transceivers |
- | * Clocking high speed ADCs, DACs | + | * Oscilloscope, |
- | * ATE and high performance instrumentation | + | * SMA cables (50 Ω) |
- | * 40 Gbps/100 Gbps OTN line side clocking | + | * 6 V wall supply (provided) |
- | * Cable/ | + | * USB cable (provided) |
- | * Test and measurement | + | |
- | \\ \\ \\ \\ \\ \\ \\ \\ \\ \\ | + | |
- | </ | + | |
+ | =====Online Resources===== | ||
+ | Required Software | ||
+ | * [[adi> | ||
+ | Documents Needed | ||
+ | * [[adi> | ||
+ | ===== GENERAL DESCRIPTION ===== | ||
+ | |||
+ | ---- | ||
+ | |||
+ | The [[adi> | ||
+ | | ||
+ | <WRAP centeralign> | ||
+ | {{: | ||
+ | \\ | ||
+ | **Figure 1. AD9525/ | ||
+ | </ | ||
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When connecting the evaluation board to a PC for the first time, you must install the evaluation software prior to connecting the evaluation board. If a previous version of the software is already installed, uninstall it before installing the latest version. | When connecting the evaluation board to a PC for the first time, you must install the evaluation software prior to connecting the evaluation board. If a previous version of the software is already installed, uninstall it before installing the latest version. | ||
- | === Power and PC Connections === | + | ==== Power and PC Connections |
- Install the AD9525 evaluation software, uninstall prior versions of the software before installation updates. Administrative privileges are required for installation. The 64-bit versions of Windows® are supported. | - Install the AD9525 evaluation software, uninstall prior versions of the software before installation updates. Administrative privileges are required for installation. The 64-bit versions of Windows® are supported. | ||
- Connect the 6V wall power supply to the main power connector labeled P500. | - Connect the 6V wall power supply to the main power connector labeled P500. | ||
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Refer to the Evaluation Board Software section for details on running the AD9525 evaluation board software. | Refer to the Evaluation Board Software section for details on running the AD9525 evaluation board software. | ||
- | === Signal Connections === | + | ==== Signal Connections |
To connect signals: | To connect signals: | ||
- Connect a signal generator to the J202 (REF A) SMA connector or to the J204 (REF B) SMA connector. By default, the reference inputs on this evaluation board are ac-coupled and terminated 50 Ω to ground. An amplitude setting of 0 dBm to 6 dBm is sufficient. | - Connect a signal generator to the J202 (REF A) SMA connector or to the J204 (REF B) SMA connector. By default, the reference inputs on this evaluation board are ac-coupled and terminated 50 Ω to ground. An amplitude setting of 0 dBm to 6 dBm is sufficient. | ||
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- SYNC_OUT can be configured as two single-ended CMOS outputs, in which case each line should be terminated with a series resistor. | - SYNC_OUT can be configured as two single-ended CMOS outputs, in which case each line should be terminated with a series resistor. | ||
- | === Bypassing the PLL (Clock Distribution Only) === | + | ==== Bypassing the PLL (Clock Distribution Only) ==== |
To bypass the PLL: | To bypass the PLL: | ||
- Connect a signal generator to the SMA connector labeled CLKIN. | - Connect a signal generator to the SMA connector labeled CLKIN. | ||
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The AD9525 default register settings configure the device as an eight output clock buffer. | The AD9525 default register settings configure the device as an eight output clock buffer. | ||
- | === Using An Off-Board VCO/VCXO === | + | ==== Using An Off-Board VCO/ |
To use an off-board VCO or VCXO: | To use an off-board VCO or VCXO: | ||
- Remove the original VCO/VCXO or disconnect all supply voltages. (You may see coupling between the VCO/VCXO paths if two VCO/VCXOs are powered at the same time, causing pulling.) | - Remove the original VCO/VCXO or disconnect all supply voltages. (You may see coupling between the VCO/VCXO paths if two VCO/VCXOs are powered at the same time, causing pulling.) | ||
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</ | </ | ||
- | The loop filter | + | The loop bandwidth of a PLL with a second-order filter (excluding R2 and C3) can be approximated using the following equation: \\ |
<WRAP centeralign> | <WRAP centeralign> | ||
< | < | ||
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* **// | * **// | ||
- | Because **// | + | Because **// |
To determine the best loop filter for a given application, | To determine the best loop filter for a given application, | ||
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The AD9525 evaluation board can be purchased with either a Z-Comm CRO2950B-LF external VCO or with no VCO populated. This section discusses a couple of different external VCO possibilities and their respective loop filter designs and performance. Using a high performance VCO with low phase noise allows you to create a low loop bandwidth filter to remove the jitter contained on the input reference clock. | The AD9525 evaluation board can be purchased with either a Z-Comm CRO2950B-LF external VCO or with no VCO populated. This section discusses a couple of different external VCO possibilities and their respective loop filter designs and performance. Using a high performance VCO with low phase noise allows you to create a low loop bandwidth filter to remove the jitter contained on the input reference clock. | ||
- | === Using the Evaluation Board with a Z-Comm CRO2950B-LF VCO === | + | ==== Using the Evaluation Board with a Z-Comm CRO2950B-LF VCO ==== |
The first setup discussed is the default evaluation board configured with a Z-Comm CRO2950B-LF VCO. With the charge pump set to 1.8 mA and the feedback divider set to 24, the on-board loop filter produces a loop bandwidth of ~6 kHz and ~69° of phase margin. Table 1 shows the parameters used to attain the resulting phase noise measurements described in Figure 4. A phase noise plot of the Z-Comm CRO2950B-LF VCO is shown in Figure 3.\\ | The first setup discussed is the default evaluation board configured with a Z-Comm CRO2950B-LF VCO. With the charge pump set to 1.8 mA and the feedback divider set to 24, the on-board loop filter produces a loop bandwidth of ~6 kHz and ~69° of phase margin. Table 1 shows the parameters used to attain the resulting phase noise measurements described in Figure 4. A phase noise plot of the Z-Comm CRO2950B-LF VCO is shown in Figure 3.\\ | ||
<WRAP column 45%> | <WRAP column 45%> | ||
<WRAP centeralign> | <WRAP centeralign> | ||
- | ^ Variable | + | ^ Variable |
| VCO Operating Frequency | | VCO Operating Frequency | ||
| Reference Frequency | | Reference Frequency | ||
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- | === Using the Evaluation Board with a Different VCO === | + | ==== Using the Evaluation Board with a Different VCO ==== |
The second setup discussed uses the evaluation board with the on-board VCO and loop filter removed. Instead, this setup uses a separate VCO daughter board with a Bowei MVCO1475 VCO and a two-pole loop filter. With the charge pump set to 1.8 mA and the N divider set to 12, the loop filter was designed to give ~11 kHz of bandwidth and ~70° of phase margin. Table 3 shows the parameters used to attain the resulting phase noise measurements described in Figure 7. A phase noise plot of the Bowei MVCO1475 VCO is shown in Figure 6. | The second setup discussed uses the evaluation board with the on-board VCO and loop filter removed. Instead, this setup uses a separate VCO daughter board with a Bowei MVCO1475 VCO and a two-pole loop filter. With the charge pump set to 1.8 mA and the N divider set to 12, the loop filter was designed to give ~11 kHz of bandwidth and ~70° of phase margin. Table 3 shows the parameters used to attain the resulting phase noise measurements described in Figure 7. A phase noise plot of the Bowei MVCO1475 VCO is shown in Figure 6. | ||
<WRAP column 45%> | <WRAP column 45%> | ||
<WRAP centeralign> | <WRAP centeralign> | ||
- | ^ Variable | + | ^ Variable |
| VCO Operating Frequency | | VCO Operating Frequency | ||
| Reference Frequency | | Reference Frequency | ||
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The AD9525 evaluation software allows the user to control the full functionality of the AD9525 through SPI/I2C communication on the evaluation board. | The AD9525 evaluation software allows the user to control the full functionality of the AD9525 through SPI/I2C communication on the evaluation board. | ||
- | === Software Installation === | + | ==== Software Installation |
Do not connect the evaluation board until the software installation is complete. | Do not connect the evaluation board until the software installation is complete. | ||
- The latest evaluation software and documentation can be downloaded from http:// | - The latest evaluation software and documentation can be downloaded from http:// | ||
- On the AD9525 Evaluation Board page, double-click AD9525Eval_Setup1.1.0.exe. (Note that the website may have a newer version.) Follow the installation instructions. | - On the AD9525 Evaluation Board page, double-click AD9525Eval_Setup1.1.0.exe. (Note that the website may have a newer version.) Follow the installation instructions. | ||
- | === Running the Software === | + | ==== Running the Software |
Power up and connect the evaluation board to the PC. See the Evaluation Board Hardware section for details on the various connectors on the evaluation board. | Power up and connect the evaluation board to the PC. See the Evaluation Board Hardware section for details on the various connectors on the evaluation board. | ||
- Windows® may automatically detect the evaluation board after the board is first plugged in. Allow Windows® to install the device drivers.\\ <WRAP centeralign> | - Windows® may automatically detect the evaluation board after the board is first plugged in. Allow Windows® to install the device drivers.\\ <WRAP centeralign> | ||
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---- | ---- | ||
The AD9525 quick start guide is intended for direct use with the AD9525/ | The AD9525 quick start guide is intended for direct use with the AD9525/ | ||
- | The AD9525 website contains a setup file to configure the AD9525/ | + | The AD9525 website contains a setup file to configure the AD9525/ |
<WRAP column 48%> | <WRAP column 48%> | ||
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\\ | \\ | ||
- | === Quick Start Steps === | + | ==== Quick Start Steps ==== |
When the evaluation software is installed, the evaluation board is connected, and the software is loaded, use the following steps to configure and lock the PLL. These steps assume that the input signal is present to REF A, that the evaluation board has not been modified, and that the PLL loop filter is suitable for a given application. | When the evaluation software is installed, the evaluation board is connected, and the software is loaded, use the following steps to configure and lock the PLL. These steps assume that the input signal is present to REF A, that the evaluation board has not been modified, and that the PLL loop filter is suitable for a given application. | ||
- Type the intended reference input frequency (in megahertz) in the REF A MHz box at the upper left corner of the main window and press ENTER. | - Type the intended reference input frequency (in megahertz) in the REF A MHz box at the upper left corner of the main window and press ENTER. | ||
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</ | </ | ||
- | ===== EVALUATION SOFTWARE COMPONENTS ===== | + | |
- | ---- | + | |